rain that has became more acidic than normal due to pollution (2 Words)

18.

molten rock that reaches a planet's surface through a volcano

19.

the vibration caused by an earthquake (2 Words)

20.

the zone of seismic and volcanic activity that coincides in general with the margins of the pacific plate (3 Words)

Down

2.

a mountain that forms as blocks of rock move up or down along normal faults in areas where the lithosphere is being pulled apart (3 Words)

3.

an opening in the crust through which molten rock, rock fragments and hot gasses erupt a mountain built up from erupted materials

4.

fault in which the hanging wall has moved downward relative to the footwall (2 Words)

7.

fracture in earth's lithosphere along which blocks of rock move past each other

8.

an insturment that constantly records ground movements

9.

a process in which the shaking of the ground causes loose wet soil to act like a liguid

11.

a shaking of the ground caused by the sudden movement of large blocks of rock along a fault

15.

the point on earth's surface directly above the focus of an earthquake

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